Going literally shitty on this one. This will probably also be a decent survey of lemmy’s demographics; every man I’ve shared this with reacts in abject terror while all the women who didn’t know you can do this look like a divine revelation had struck them. 🤣
The average vagina is 3-4 inches and so are the average fingers, and most people are relatively proportional (I looked it up ages ago to see how plausible it is to actually get a diva cup stuck and came to the conclusion that too many women have just been shamed / terrified out of putting their own fingers in their own vaginas but I digress). I estimate that the thumb is probably 2/3 to 3/4 the length of the fingers so while you wouldn’t get to full depth, most of the shit is going to continue descending once the space below it is free, unless you’ve got one of those special kinds of blockages that’s above this tip’s paugrade.
Bonus content for anyone doubting my size estimates… I personally like what she considers the larger end like 5-6 or so but I’m also 6 foot tall and men shorter than me don’t even bother most of the time so, again, proportions people.